Valve-gear for turbines.



C. ROTH.

VALVE GEAR FOR TURBINBS.

APPLIOA'TION FILED 0012.18. 1906.

Patnted Sept. 14, 1909.

l: I: e:

'firm/Mfrs.

www;

UNITED STATES A TENT OFFICE.

CARL ROTH, OF MUNICH, GERMANY, ASSIGNOR TO MELMS & PFENNINGER, G. IVI.B. H., OF MUNICH-HIRSCHAU, GERMANY, A COMPANY.

VALVE-GEAR FOR TURBINES.

Specification of Letters Patent.

Patented Sept. 14, 1909.

Application filed October 18, 1906. Serial No. 339,578.

the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of this specication.

My invention relates to valve gear for turbines and other fluid pressureengines, of the kind in which the pressure fluid is caused to beadmitted to the engine in a pulsatory manner by means of a throttlevalve having a reciprocatory or the like intermittent movement which isindependent of the governor of the engine.

The invention has for its chief object to provide for the said throttlevalve an auxiliary orsupplementary control operated from the governor sothat the movements of the valve, which are produced independently of thegovernor, will nevertheless be regulated thereby as regards theirperiods or their length of stroke according to the load.

In the drawings, Figure 1 is a diagrammatic, vertical section of theinvention applied to a steam valve for a turbine; and Fig. 2 is an endView of a governor adapted for the purposes of my invention.

In the said drawing: a is the live steam pipe, b the inlet passage tothe turbine, and c the admission valve, through the ports Z of which thesteam is admitted to the turbine. The admission valve is rigidlyconnected with the pist-on e which can move to and fro in the cylinderf, under the influence of the spring m. The cylinder f is connected witha pipe a through the channel it, and with the atmosphere through thechannel z'. The channel i can be partly or wholly shut off by means of avalve 7c. When it is completely shut oif, the steam admission pressureis established in the chamber g below the piston e, so that said piston,together with the admission valve c rigidly connected therewith, israised in opposition to the resistance of the spring m, andcommunication is established between the pipe or channels c and o by theports d. If the valve la only partially closes the channel a', part ofthe steam under the piston c escapes from said channel a' and the springm causes the descent of the piston and also of the admission valve c,the result being that the ports d are partially or entirely closed, asthe case may be. The device as above described is of the well knowntype.

According to the present invention the regulating or control valve 70 isconnected as by means of a lever r' and a rod u with an eccentric Z orthe like driven directly or indirectly from the engine shaft in thepresent instance shown as driven through the governor shaft mx so thatat each revolution of said shaft the regulation valve 7c is turnedthrough an angle dependent upon the throw of the eccentric which isgoverned by the sliding movement of the weights n, one of which carriesthe eccentric L. In the instance illustrated, the regulating valveconsists of a cock containing a hollow bush or plug open to theatmosphere and to the channel z'. The eccentric produces an oscillatorymovement of the valve 7c at all times, independently of the action ofthe governor s, and by this means fluctuations of pressure are effectedunder the piston e and result in a continual opening and closing of theadmission valve. The actual governing of the speed is effected by therotating mass a of the governor determining the throw or degree ofeccentricity of the said eccentric in accordance with the load on theengine. The variation of the eccentricity causes the regulating valve lato be opened to a greater or less extent, thus placing the chamber g incommunication with the atmosphere for a longer or shorter period oftime, in consequence of which the admission valve is closed for a longeror shorter time at each stroke.

In Fig. 2, I have shown a conventional form of governor having arotating suppor provided with recesses or grooves l and 2, to receivesliding blocks 3 and il. The blocks 3 and 4 are connected to the weightsa, a by links 5 and 6 in the usual manner, but as the blocks and linksform no part of my invention, I have deemed it unnecessary tospecifically describe their coperate relation.

lVhat I claim is:

1. In a governing mechanism for turbines, the combination of a mainvalve, an auxiliary valve varying the region of movement of the mainvalve, and means controlling the movement of the auxiliary valve andvarying the amplitude of the movement of the auxiliary valve accordingto the load.

A2. In a governino' mechanism for turbinesI` the combination o? a mainvalve, an auxiliary valve varying the region of movement of the mainvalve, and means controlling the movement of the auxiliary valve andvarying the amplitude of the movement of the auxiliary valve accordingto the load; said means comprising` an eccentric mounted to move andvary its degree of eccentricity according to the load.

3. In a governing mechanism for turbines,

the combination of a main valve, an auxil-v iary valve varying theregion of movement of the main valve, and means controlling the movementof the auxiliary valve and varying the amplitude of the movement of theauxiliary valve according to the load; said 2.

means comprising a movable eccentric, and means carrying the eccentricand mounted to move by centrifugal force to vary the degree ofeccentricity of the eccentric according to the load. 3o

movement of the auxiliary valve and vaiy- 35 ing the amplitude of themovement of the auxiliary valve according to the load; said meanscomprising an eccentric, and a centrifugal governorconnected .to saideccentric and adapted to vary the degree of eccentricity of theeccentric according to the load. In testimony, that I claim theforegoing as my invention, I have signed my name in presence of twosubscribing Witnesses.

CARL ROTI-I. lVitnesses ABRAHAM SoriLEsiNGER, LoUIsYF. MUELLER.

